I. Summary
The mill is intended for manufacturing of round pipe of Φ48mm-Φ159mm with thickness of 1.5mm–6.0mm from cold-rolled and hot-rolled coil strip by means of unclosed tubular blank with its subsequent welding into tube, edge heating by means of solid state high-frequency welder, longitudinal seam welding in rolls of tube welding machine, cooling, further sizing or shaping and on-stream cutting of endless tube in measured lengths.
Finished product will be of round pipe, square and rectangle pipe.
II. The technical flow of the production line
{SteelTape}→→ Double-arbor un-coiler →→Seven-roll Flattener→→Strip-head Cutter and welder→→Spiral accumulator→→Forming section(Flattening unit +Main driving unit +Forming unit +Guide unit +High frequency induction welding unit +squeeze roller)+ Removing External and internal burr→→Cooling unit →→ Sizing unit and straightener →→Flying saw under computer-control →→ Run-out table
III. Basic conditions:
a) Steel Pipe Specification
1. Round Pipe diameter: Φ48mm-Φ159mm
Pipe Thickness: 1.5– 6.0mm
2. Square pipe: 40x40-125X125mm
Rectangle pipe: 30x50-120X130mm
Pipe Thickness: 1.5 – 6.0mm
3. Pipe Length: 5.0m – 12.0m
4. Length Tolerance: 0-3mm(on 6 meter tube )
b) SteelTape Specification
1. Material: Low Carbon steel(δb≤500Mpa, δs≤235Mpa)
2. Steel Tape: Inner diameter: Φ508-610mm
Outer diameter: Φ900-1800mm
Strip steel width: 160mm-500mm
Strip steel thickness: 1.5mm-6.0mm
The maximum weight: 8.0 tons
c) Electricity
1. Dynamic power: AC380V±10%, 3phases, 50Hz±1.0%
2. Control Power: AC220V±10%, one phase, 50 Hz ±1.0%
d) Electric installed capacity: appro. 900KW
e) Cooling water
1. Reservoir for High Frequency equipment: 35m³, one set
2. Reservoir for circulating cooling water: 25m³, one set
f) Compressed air
1. Pressure: 0.4Mpa
2. Flow: 3.0m3/h
g) Production capacity
Annual output: 100,000 ton, according to the yearly working days,daily working hours and the products.
h) Line speed: 20-80m/min
